JAMB 1997 · UME · Q43

The pie chart shows the income of a civil servant in a month. If his monthly income is ₦6000, find his monthly basic salary.

Worked solution (try it first)

The angles at the centre add up to $360^\circ$ , so Basic is $360^\circ - (69^\circ + 60^\circ + 61^\circ + 50^\circ)$ , which is $120^\circ$ .
$120^\circ$ is $\frac{120}{360} = \frac13$ of the circle.
So the basic salary is $\frac13 \times 6000 = 2000$ naira: ₦2000, option A.